@import "./textarea.vars";

// Textarea
// --------------------------------------------------

:host {
  /**
   * @prop --background: Background of the textarea
   *
   * @prop --border-radius: Border radius of the textarea
   * @prop --border-color: Color of the border below the textarea when using helper text, error text, or counter
   * @prop --border-radius: Radius of the textarea border. A large radius may display unevenly when using fill="outline"; if needed, use shape="round" instead or increase --padding-start.
   * @prop --border-style: Style of the border below the textarea when using helper text, error text, or counter
   * @prop --border-width: Width of the border below the textarea when using helper text, error text, or counter
   *
   * @prop --color: Color of the text
   *
   * @prop --placeholder-color: Color of the placeholder text
   * @prop --placeholder-font-style: Style of the placeholder text
   * @prop --placeholder-font-weight: Weight of the placeholder text
   * @prop --placeholder-opacity: Opacity of the placeholder text
   *
   * @prop --highlight-height: The height of the highlight on the textarea. Only applies to md mode.
   * @prop --highlight-color-focused: The color of the highlight on the textarea when focused
   * @prop --highlight-color-valid: The color of the highlight on the textarea when valid
   * @prop --highlight-color-invalid: The color of the highlight on the textarea when invalid
   *
   * @prop --padding-top: Top padding of the textarea
   * @prop --padding-end: Right padding if direction is left-to-right, and left padding if direction is right-to-left of the textarea
   * @prop --padding-bottom: Bottom padding of the textarea
   * @prop --padding-start: Left padding if direction is left-to-right, and right padding if direction is right-to-left of the textarea
   */
  --background: initial;
  --color: initial;
  --placeholder-color: initial;
  --placeholder-font-style: initial;
  --placeholder-font-weight: initial;
  --placeholder-opacity: #{$placeholder-opacity};
  --padding-top: 0;
  --padding-end: 0;
  --padding-bottom: #{$textarea-padding-bottom};
  --padding-start: 0;
  --border-radius: 0;
  --border-style: solid;
  --highlight-color-focused: #{ion-color(primary, base)};
  --highlight-color-valid: #{ion-color(success, base)};
  --highlight-color-invalid: #{ion-color(danger, base)};

  /**
   * This is a private API that is used to switch
   * out the highlight color based on the state
   * of the component without having to write
   * different selectors for different fill variants.
   */
  --highlight-color: var(--highlight-color-focused);

  display: block;
  position: relative;

  width: 100%;

  min-height: 44px;

  color: var(--color);

  font-family: $font-family-base;

  z-index: $z-index-item-input;

  box-sizing: border-box;
}

// Textarea Wrapper
// ----------------------------------------------------------------

/**
 * Since the label sits on top of the element,
 * the component needs to be taller otherwise the
 * label will appear too close to the textarea text.
 * Also, floating and stacked labels should not
 * push the label down since it it
 * sits on top of the textarea.
 */
:host(.textarea-label-placement-floating),
:host(.textarea-label-placement-stacked) {
  --padding-top: 0px;

  min-height: 56px;
}

/**
 * When the cols property is set we should
 * respect that width instead of defaulting
 * to taking up the entire line.
 * Requires both the cols and autoGrow
 * properties to be reflected as attributes
 * on the host.
 *
 * cols does not work with autoGrow because
 * autoGrow would prevent line breaks from naturally
 * occurring until the textarea takes up the entire line width.
 */
:host([cols]:not([auto-grow])) {
  width: fit-content;
}

:host(.ion-color) {
  --highlight-color-focused: #{current-color(base)};

  background: initial;
}

// Textarea Within An Item
// --------------------------------------------------

:host-context(ion-item) {
  align-self: baseline;
}

:host-context(ion-item)[slot="start"],
:host-context(ion-item)[slot="end"] {
  width: auto;
}

// Native Textarea
// --------------------------------------------------

.native-textarea {
  // Browsers may add a default margin to the textarea
  @include margin(0);
  @include padding(0, 0, 0, 0);

  display: block;

  position: relative;

  flex: 1;

  width: 100%;
  max-width: 100%;
  max-height: 100%;

  border: 0;

  outline: none;

  background: transparent;

  white-space: pre-wrap;

  /**
   * This ensures the textarea
   * remains on top of any decoration
   * that we render (particularly the
   * outline border when fill="outline").
   * If we did not do this then Axe would
   * be unable to determine the color
   * contrast of the textarea.
   */
  z-index: 1;
  box-sizing: border-box;
  resize: none;
  appearance: none;

  &::placeholder {
    @include padding(0);

    color: var(--placeholder-color);

    font-family: inherit;
    font-style: var(--placeholder-font-style);
    font-weight: var(--placeholder-font-weight);

    opacity: var(--placeholder-opacity);
  }
}

.native-textarea {
  color: inherit;

  font-family: inherit;
  font-size: inherit;
  font-style: inherit;
  font-weight: inherit;

  letter-spacing: inherit;

  text-align: inherit;
  text-decoration: inherit;
  text-indent: inherit;
  text-overflow: inherit;
  text-transform: inherit;

  grid-area: 1 / 1 / 2 / 2;

  word-break: break-word;
}

// Input Cover: Unfocused
// --------------------------------------------------
// The input cover is the div that actually receives the
// tap/click event when scroll assist is configured to true.
// This make it so the native input element is not clickable.
// This will only show when the scroll assist is configured
// otherwise the .input-cover will not be rendered at all
// The input cover is not clickable when the input is disabled
.cloned-input {
  @include position(0, null, 0, 0);

  position: absolute;

  pointer-events: none;
}

/**
 * The cloned input needs to be disabled on
 * Android otherwise the viewport will still
 * shift when running scroll assist.
 */
.cloned-input:disabled {
  opacity: 1;
}

:host([auto-grow]) .cloned-input {
  // Workaround for webkit rendering issue with scroll assist.
  // When cloning the textarea and scrolling into view,
  // a white box is rendered from the difference in height
  // from the auto grow container.
  // This change forces the cloned input to match the true
  // height of the textarea container.
  height: 100%;
}

:host([auto-grow]) .native-textarea {
  overflow: hidden;
}

// Textarea Wrapper
// ----------------------------------------------------------------

.textarea-wrapper {
  @include padding(0px, var(--padding-end), 0px, var(--padding-start));
  @include border-radius(var(--border-radius));

  display: flex;

  position: relative;

  flex-grow: 1;

  align-items: flex-start;

  height: inherit;

  min-height: inherit;

  transition: background-color 15ms linear;

  background: var(--background);

  line-height: normal;
}

// Textarea Native Wrapper
// ----------------------------------------------------------------

.native-wrapper {
  position: relative;

  width: 100%;

  height: 100%;
}

// Textarea Native
// ----------------------------------------------------------------

:host(.has-focus) textarea {
  caret-color: var(--highlight-color);
}

.native-wrapper textarea {
  @include padding(var(--padding-top), 0px, var(--padding-bottom), 0px);
}

.native-wrapper {
  display: grid;

  min-width: inherit;
  max-width: inherit;
  min-height: inherit;
  max-height: inherit;

  /**
   * This avoids a WebKit bug where
   * the height of the inner textarea
   * is incorrect and flows outside the
   * parent container: https://bugs.webkit.org/show_bug.cgi?id=256781
   * TODO FW-4734
   */
  grid-auto-rows: 100%;

  &::after {
    // This technique is used for an auto-resizing textarea.
    // The text contents are reflected as a pseudo-element that is visually hidden.
    // This causes the textarea container to grow as needed to fit the contents.

    white-space: pre-wrap;

    content: attr(data-replicated-value) " ";

    visibility: hidden;
  }
}

.native-wrapper::after {
  @include padding(var(--padding-top), 0, var(--padding-bottom), 0);
  @include margin(0, 0, 0, 0);
  @include border-radius(var(--border-radius));

  /**
   * Note: Do not use @include text-inherit()
   * as that sets white-space: inherit
   * Instead, we use white-space: pre-wrap above.
   */
  color: inherit;

  font-family: inherit;
  font-size: inherit;
  font-style: inherit;
  font-weight: inherit;

  letter-spacing: inherit;

  text-align: inherit;
  text-decoration: inherit;
  text-indent: inherit;
  text-overflow: inherit;
  text-transform: inherit;

  grid-area: 1 / 1 / 2 / 2;

  word-break: break-word;
}

.textarea-wrapper-inner {
  display: flex;

  width: 100%;
  min-height: inherit;
}

// Textarea Highlight
// ----------------------------------------------------------------

:host(.ion-touched.ion-invalid) {
  --highlight-color: var(--highlight-color-invalid);
}

/**
 * The component highlight is only shown
 * on focus, so we can safely set the valid
 * color state when touched/valid. If we
 * set it when .has-focus is present then
 * the highlight color would change
 * from the valid color to the component's
 * color during the transition after the
 * component loses focus.
 */
:host(.ion-valid) {
  --highlight-color: var(--highlight-color-valid);
}

// Textarea Bottom Content
// ----------------------------------------------------------------

.textarea-bottom {
  /**
   * The bottom content should take on the start and end
   * padding so it is always aligned with either the label
   * or the start of the textarea.
   */
  @include padding(5px, var(--padding-end), 0, var(--padding-start));

  display: flex;

  justify-content: space-between;

  border-top: var(--border-width) var(--border-style) var(--border-color);

  font-size: dynamic-font(12px);

  white-space: normal;
}

/**
 * If the textarea has a validity state, the
 * border and label should reflect that as a color.
 */
:host(.has-focus.ion-valid),
:host(.ion-touched.ion-invalid) {
  --border-color: var(--highlight-color);
}

// Textarea Hint Text
// ----------------------------------------------------------------

/**
 * Error text should only be shown when .ion-invalid is
 * present on the textarea. Otherwise the helper text should
 * be shown.
 */
.textarea-bottom .error-text {
  display: none;

  color: var(--highlight-color-invalid);
}

.textarea-bottom .helper-text {
  display: block;

  color: $text-color-step-300;
}

:host(.ion-touched.ion-invalid) .textarea-bottom .error-text {
  display: block;
}

:host(.ion-touched.ion-invalid) .textarea-bottom .helper-text {
  display: none;
}

// Textarea Max Length Counter
// ----------------------------------------------------------------

.textarea-bottom .counter {
  /**
   * Counter should always be at
   * the end of the container even
   * when no helper/error texts are used.
   */
  @include margin-horizontal(auto, null);

  color: $text-color-step-300;

  white-space: nowrap;

  padding-inline-start: 16px;
}

// Textarea Label
// ----------------------------------------------------------------

.label-text-wrapper {
  @include padding(var(--padding-top), 0px, var(--padding-bottom), 0px);

  /**
   * Label text should not extend
   * beyond the bounds of the textarea.
   * However, we do not set the max
   * width to 100% because then
   * only the label would show and users
   * would not be able to see what they are typing.
   */
  max-width: 200px;

  transition: color 150ms cubic-bezier(0.4, 0, 0.2, 1), transform 150ms cubic-bezier(0.4, 0, 0.2, 1);

  /**
   * This ensures that double tapping this text
   * clicks the <label> and focuses the textarea
   * when a screen reader is enabled.
   */
  pointer-events: none;
}

/**
 * We need to use two elements instead of
 * one. The .label-text-wrapper is responsible
 * for centering the label text vertically regardless
 * of the textarea height using flexbox.
 *
 * The .label-text element is responsible for controlling
 * overflow when label-placement="fixed".
 * We want the ellipses to show up when the
 * fixed label overflows, but text-overflow: ellipsis only
 * works on block-level elements. A flex item is
 * considered blockified (https://www.w3.org/TR/css-display-3/#blockify).
 */
.label-text,
::slotted([slot="label"]) {
  text-overflow: ellipsis;

  white-space: nowrap;

  overflow: hidden;
}

/**
 * If no label text is placed into the slot
 * then the element should be hidden otherwise
 * there will be additional margins added.
 */
.label-text-wrapper-hidden,
.textarea-outline-notch-hidden {
  display: none;
}

.textarea-wrapper textarea {
  /**
   * When the floating label appears on top of the
   * textarea, we need to fade the textarea out so that the
   * label does not overlap with the placeholder.
   */
  transition: opacity 150ms cubic-bezier(0.4, 0, 0.2, 1);
}

// Textarea Label Placement - Start
// ----------------------------------------------------------------

/**
 * Label is on the left of the textarea in LTR and
 * on the right in RTL.
 */
:host(.textarea-label-placement-start) .textarea-wrapper {
  flex-direction: row;
}

:host(.textarea-label-placement-start) .label-text-wrapper {
  /**
   * The margin between the label and
   * the textarea should be on the end
   * when the label sits at the start.
   */
  @include margin(0, $form-control-label-margin, 0, 0);
}

// Textarea Label Placement - End
// ----------------------------------------------------------------

/**
 * Label is on the right of the textarea in LTR and
 * on the left in RTL.
 */
:host(.textarea-label-placement-end) .textarea-wrapper {
  flex-direction: row-reverse;
}

/**
 * The margin between the label and
 * the textarea should be on the start
 * when the label sits at the end.
 */
:host(.textarea-label-placement-end) .label-text-wrapper {
  @include margin(0, 0, 0, $form-control-label-margin);
}

// Textarea Label Placement - Fixed
// ----------------------------------------------------------------

:host(.textarea-label-placement-fixed) .label-text-wrapper {
  /**
   * The margin between the label and
   * the textarea should be on the end
   * when the label sits at the start.
   */
  @include margin(0, $form-control-label-margin, 0, 0);
}

/**
 * Label is on the left of the textarea in LTR and
 * on the right in RTL. Label also has a fixed width.
 */
:host(.textarea-label-placement-fixed) .label-text {
  flex: 0 0 100px;

  width: 100px;
  min-width: 100px;
  max-width: 200px;
}

// Textarea Label Placement - Stacked and Floating
// ----------------------------------------------------------------

/**
 * Stacked: Label sits above the textarea and is scaled down.
 * Floating: Label sits over the textarea when the textarea has no
 * value and is blurred. Label sits above the textarea and is scaled
 * down when the textarea is focused or has a value.
 *
 */
:host(.textarea-label-placement-stacked) .textarea-wrapper,
:host(.textarea-label-placement-floating) .textarea-wrapper {
  flex-direction: column;
  align-items: start;
}

/**
 * Ensures that the label animates
 * up and to the left in LTR or
 * up and to the right in RTL.
 */
:host(.textarea-label-placement-stacked) .label-text-wrapper,
:host(.textarea-label-placement-floating) .label-text-wrapper {
  @include transform-origin(start, top);
  @include padding(0px);

  max-width: 100%;

  /**
   * The 2 ensures the label
   * remains on top of any browser
   * autofill background too.
   */
  z-index: 2;
}

/**
 * Ensures the textarea does not
 * overlap the label.
 */
:host(.textarea-label-placement-stacked) textarea,
:host(.textarea-label-placement-floating) textarea,
:host(.textarea-label-placement-stacked[auto-grow]) .native-wrapper::after,
:host(.textarea-label-placement-floating[auto-grow]) .native-wrapper::after {
  @include margin(8px, 0px, 0px, 0px);
}

:host(.textarea-label-placement-stacked) ::slotted([slot="start"]),
:host(.textarea-label-placement-stacked) ::slotted([slot="end"]),
:host(.textarea-label-placement-floating) ::slotted([slot="start"]),
:host(.textarea-label-placement-floating) ::slotted([slot="end"]) {
  margin-top: 8px;
}

/**
 * This makes the label sit over the textarea
 * when the textarea is blurred and has no value.
 */
:host(.textarea-label-placement-floating) .label-text-wrapper {
  @include transform(translateY(100%), scale(1));
}

/**
 * The textarea should be hidden when the label
 * is on top of the textarea. This prevents the label
 * from overlapping any placeholder value.
 */
:host(.textarea-label-placement-floating) textarea {
  opacity: 0;
}

:host(.has-focus.textarea-label-placement-floating) textarea,
:host(.has-value.textarea-label-placement-floating) textarea {
  opacity: 1;
}

/**
 * This makes the label sit above the textarea.
 */
:host(.label-floating) .label-text-wrapper {
  @include transform(translateY(50%), scale(#{$form-control-label-stacked-scale}));

  /**
   * Label text should not extend
   * beyond the bounds of the textarea.
   */
  max-width: calc(100% / #{$form-control-label-stacked-scale});
}

// Start/End Slots
// ----------------------------------------------------------------

.start-slot-wrapper, .end-slot-wrapper {
  @include padding(var(--padding-top), 0, var(--padding-bottom), 0);

  display: flex;

  flex-shrink: 0;

  align-self: start;
}

::slotted([slot="start"]),
::slotted([slot="end"]) {
  margin-top: 0; // ensure slot content is vertically aligned with label
}

::slotted([slot="start"]:last-of-type) {
  margin-inline-end: $form-control-label-margin;
  margin-inline-start: 0;
}

::slotted([slot="end"]:first-of-type) {
  margin-inline-start: $form-control-label-margin;
  margin-inline-end: 0;
}
